XML 91 R78.htm IDEA: XBRL DOCUMENT v3.3.1.900
Commitments and Contingencies, Fuel Contracts (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Minimum  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Fuel Contract Expiration Date (year) 2016
Maximum  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Fuel Contract Expiration Date (year) 2060
Coal  
Fuel Contracts [Abstract]  
2016 $ 302.3
2017 230.3
2018 118.5
2019 42.0
2020 43.6
Thereafter 332.3
Total 1,069.0
Natural Gas Supply  
Fuel Contracts [Abstract]  
2016 231.1
2017 129.5
2018 181.0
2019 187.6
2020 203.4
Thereafter 409.6
Total 1,342.2
Natural Gas Storage and Transportation  
Fuel Contracts [Abstract]  
2016 137.5
2017 137.2
2018 85.5
2019 51.0
2020 50.4
Thereafter 773.2
Total $ 1,234.8